On Tue, 2011-09-27 at 20:44 +0530, Sriram Gopalan wrote: [...] > > > 3) However, when we attempt the followings, it does not work. We cannot hear > > > any audio, whereas the same works on my Ubuntu 10.10 desktop > > > #arecord | aplay > > > > Are you saying that this doesn't work, or is the silence expected? Are > > you sure you're recording from the alsa hardware card and not from the > > pulse virtual alsa device? (I'm sorry for using the wrong terminology > > here) > [Sriram] silence is not expected. I would expect a ramping up echo. Really depends on the relative level between capture and playback. [...] > > > 3) However, when we attempt the followings, it does not work. We > > > cannot hear any audio, whereas the same works on my Ubuntu 10.10 > > > desktop > > > #arecord | aplay > > > #gst-launch alsasrc ! alsasink > > > #pactl load-module module-loopback > > > > Incidentally, why are all the tests with alsasrc/alsasink and not > > pulsesrc/pulsesink? > > [Sriram] I will try pulsesrc and pulsesink as well. I have not done that It's best if you test one piece at a time. Something like: gst-launch-0.10 audiotestsrc ! pulsesink and gst-launch-0.10 pulsesrc ! wavenc ! filesink location=record.wav paplay record.wav Make sure the correct device is selected in each case (you can tweak this with the device property on pulsesink/pulsesrc), and that your mixer controls are correctly initialised -- for custom hardware, you might need to provide PulseAudio with additional information about the mixer path. This wiki page might help a bit with that: http://pulseaudio.org/wiki/WritingProfiles Cheers, Arun
